Effect of Microstructure Changes on Mechanical Properties of La₆₆Al₁₄(Cu, Ni)₂₀ Amorphous and Crystalline Alloys
Name
AMMNS004.pdf
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605.22 KB
Format
Adobe PDF
Checksum (MD5)
4783253c024e7e549938f477d3f3e069
Author(s)
Zhang, Yong
Lee, Irene Mei Ling
Tan, Hao
Jing, Qin
Li, Yi
Date Issued
January 2004
Series/Report no.
Advanced Materials for Micro- and Nano-Systems (AMMNS);
Abstract
The microstructure, and phase selections of La₆₆Al₁₄(Cu, Ni)₂₀ alloy were studied by Bridgman solidifications, and composite materials of dendrites in amorphous matrix or micro- and nano- sized eutectic matrix were formed with different cooling rates. The volume fraction of the dendrite phase reaches a maximum at the cooling rate of about 15 K/s, the secondary dendrite arm spacing λ₂ decreases from 4.3 µm to 0.6 µm with the increasing of cooling rate R, and obeys the equation of λ₂R⁰.⁵⁷=1.74µm(K/s)R⁰.⁵⁷. The compression strength, as well as the elastic strain limit of the dendrite/amorphous matrix composite are 600 MPa, and 2.3%, respectively. Improved ductility was observed for the dendrite amorphous matrix composites with more dendrite phase by slow cooling rate.
Subjects
Bridgman solidification
bulk metallic glass
eutectic
La-based alloy
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